Mounting for electric motors



April 13 1926.

.' A. P. DANIEL MOUNTING FOR ELECTRIC MOTORS .1 .d 31 1922 2 Sheets-Sheet l A ril 13,1926. I 1,580,587

A. P. DANIEL MOUNTING FOR ELECTRIC MOTORS Filed Jan, 31, 1922 2 Sheen s-Sheet. 2

HIIIHIII Patented Apr. 13, 1926.

UNITED STATES assess? PATENT VGFFEQE.

ALLAN P. DANIEL, OF SPRINGFIELD, OHIO, ASSIGNOB TO THE BAUER BROTHERS COMPANY, OF SPRINGFIELD, OHIO, A CORPORATION OF OHIO.

MOUNTING FOR ELECTRIC MOTORS.

Application filed January 31, 1922. Serial No. 533,181.

To all whom it may concern Be it known that I, ALLAN P. DANIEL, a citizen of the United States, residing at Springfield, in the county of Clark and State of Ohio, have invented certain new and useful Improvements in Mountings for Electric Motors, of which the following is a specification.-

My invention relates to improvements in mountingsfor electric motors, it particularly relating to a mounting for a motor designed to drive a revoluble grinding member of a grinding or attrition mill.

The object of my invention is to provide r a mounting for the rotor and stator of an electric motor so constructed as to provide for independently supporting the rotor and stator of the motor in a way that when the parts are assembled they will automatically align themselves in proper position to furnish a proper and uniform air gap between the same.

A further and more specific object of the invention is to provide-for supporting the stator and rotor of the motor on the main frame of the machine, the bearing housings for the rotorv and points of attachment for the stator being cast en bloc, whereby the same may be finished atone setting so that when the parts are assembled the stator will be automatically brought in true axial and concentric relation with the rotor.

A further object of the invention is to provide a construction which is simple in character, economical in manufacture and effective in its operation.

In the accompanying drawings Fig. 1 is a top plan of a part of anattrition mill illustrating my improvements.

Fig. 2 is a longitudinal section of the same.

Fig. 3 is a detail of one of the bearing housings before split to form the cap.

Referring to the drawings, 1 represents a main supporting base having vertical standards 2 which support bearing housings 3 and 41. The base, standards and housings are cast en bloc, the housing caps 3 and 4* being formed by splitting the same from the housing proper, this being accomplished by formingthe casting with a series of cored openings 0 which extend parallel to and in horizontal alignment with the axis of the shaft hereinafter referred to, which openings will constitute the division line between the housings proper and their caps, and employing a splitting wedge. The housings and caps are then connected together by the cap screws 3 and 4?, the threaded openings which receive the screws having been tapped before splitting,' and the housings and their caps are finlshed by machining the ends and interior thereof, which by reason of the integral construction may be accomplished at a single setting of the casting, so far as the housings are concerned, thus ensuring the greatest accuracy. By thus splitting the caps from the housings proper the caps and housings fit together perfectly when assembled to thereby maintainthe accuracy of the finished surfaces.

Fitted to the inner walls of the housing 3 and its cap is a finished split bushing 5 which has a pin 6 projecting into a drilled recess in the cap to prevent rotation of the bushing; this bushing acting as a stabilizer at this point and also as an oscillating center to carry its pivotal load. slidably mounted in this bushing are the rings 7 and 8 and balls 9 of antifriction bearings, the ring 8 being clamped to a shoulder on the shaft 10 by the lock-nut 11. This shaft constitutes the driven shaft for a driven member shown in the present case as one of the grinding heads 12 of an attrition mill, which is mounted in the casing 13.

The other end of the shaft is supported in the housing 4:. A retainer 14 is slidably mounted in the housing and held from rota-- tion by a key 15. One ring 16 of the antifriction bearings is locked in a recessed portion of the retainer by a washer 17 and a pair of double gib keys 18, one only of which is shown in dotted lines, which embrace the retainer and washer. The other ring 19 is clamped to a shoulder on the shaft by the lock-nut 20.

A spring 21, interposed between the re tainer and the head 22, which is slidably mounted in a guide 23, secured to the end of the housing 4:, serves to hold the grinding head in yieldable grinding relation with the opposing head (not shown), and suitable quick release devices are employed for holding the head 22' against movement but quickly releasingsame to permit separation of the grinding member, but as the quick release devices form no part of the present invention, they will not be described in detail.

The shaft 10 has keyed thereto the armature 24 of an electric motor. The fields 25 of the motor are carried by a housing or ring 26 which is in turn supported through a pair of spiders 27 and 28 from the respective housings. Each of the spiders is cupshaped and centrally-apertured to permit the passage therethrough of the shaft 10. Each of the spiders is formed with a centrally-arranged projecting boss or trunnion 2'? and 28 the outer periphery of which is finished to lie in concentric and facial relation to the inner wall of the res TdCL lVQ housings within which the trunnions snugly and accurately fit, with the inner wal s thereof extending in close proximity to the shaft and formed with an inner peripheral groove 29 to provide a dust seal. That portion of each spider immediately surrounding its trunnion is machined to form a nnished face as indicated at 27 and 28" so as to facially align itself with the finished face on the end of the corresponding housing; these faces lying at right angles or perpendicular to the axis of rotation of the shaft. The spiders are secured to the respective housings by the machine bolts 30, thereby causing the spi lers when assembled to assume automatically a true axial and concentric relation with the axis of the rotatable shaft 10.

Each spider is also machined to provide a finished face 27 and 28 on its outer periphery, which face will be axially aligned and in concentric relation with the longitudinal axis of the spider and hence with the axis of rotation of the shaft 10. These faces receive the shouldered edges 26 of the ring 26 which are int-eriorly finished to lie in con-- centric and facial relation with the faces of the spiders and hence in concentric relation with the axis of rotationjof the shaft. The ring 26 is secured to the spider 2"? by the machine bolts 31, it being, however, not connected to the spider 28 but merely supported thereby so that more or less play is allowed between the ring and spider 28, preventing distortion the parts.

By the construction described, E am enabled to support the rotor and stator of the motor in a way to insure a proper and uniform air gap between the same, this being due to the fact that the finished seats formed on each housing for the rotor shaft bearings and for the reception of the stator support may be finished at one operation so as to insure their concentricity, the rotor and stator being thereby supported from a single fixed point finished to cause them to be automatically aligned. By also casting both housings integrally with the base, or with each other, it will be further seen that both housings may be finished at the same setting, thereby further insuring the automatic alignment of the parts when assembled.

Another advantage in the construction is that the motor parts including the support ing spiders may be removed, en-dcaps placed on the housings, and a pulley on the shaft,

thus converting the machine into a belt drive.

lVhile I have shown the slip connection between the support 26 and the spider 28 to prevent distortion of the parts, the same result may be accomplished by providing for a slippage at some other point. For instance, the bolts 30 which connect the spider 27 with the housing 3 may be omitted so that the slippage may occur between the trunnion of that spider and the housing. In such case the support 26 will be connected with the spider 28 in the same manner that it is connected with the spider 27.

Having thus described my invention, I claim I 1. In a structure of the character de scribed, a pair of axially aligned housings, a shaft rotatably mounted in said housings, a rotor of an electric motor connected to said shaft, pair of supports having trunnions fitted to the interior of said housings, said supports being rigidly connected to said housings, said supports having supporting surfaces, and a motor stator mounted on said surfaces and rigidly connected to one of said supports, said stator and the other support being left unconnected to provide for slippage.

2. in a structure of the character described, a pair of aligned housings, a shaft rotatably mounted in said housings, a rotor for an electric motor connected to said shaft, a pair of stationary supporting members supported by said housings, and a stator for said motor carried by said supports, said housings, supports and stator being all rigidly connected together except at one point of support which is left unconnected to provide for slippage.

S. In a structure of the character described, a pair of aligned housings, a shaft rotatably mounted in said housings, a rotor for an electric motor'connected to said shaft, a pair of stationary supporting members supported by said housings, and a stator for said motor carried by said supports, said housings, supports and stator being all rigidly connect-ed together except at a point between the stator and one of said sup-- porting members which is left unconnected to provide a slippage.

In testimony whereof, I have hereunto set my hand this 28th day of January, 

